Very enjoyable book. It was at the top of my Christmas list. IIRC, these photos are from the author's personal collection.
A fun thing to do is to visit the sites where these photos were taken. I dropped by Dorchester, NH (Plate #16), which is in the middle of nowhere. To my amazement, the buildings in the picture seem to be exactly as they were in 1929.
ps, Terence: Give in. You really do need a Cirkut!